Revert "Revert "Refined add/sub analysis vis-a-vis SIMD idioms.""

Bug: b/74026074

Looks like this CL is not the culprit :( Apologies Aart.

This reverts commit 7f31326f7956d6a1630e7e53473b0581705796ec.

Change-Id: I15830324bb276129bf44caf232af24d7c022ed9a
4 files changed